how do I include a security deposit in a special offer if one wasn't normally included in my listing

[Lana48]

I have a large group and agreed to host them because they are willing to pay a refundable security deposit .  I don't normally include this.  When I go to add it to their special offer I can't

[Cynthia-and-Chris1]

@Lana48 You’re right, you can’t. Airbnb does not allow you to request additional deposits. Whatever deposit you have in play on your profile when the guest books is what sticks. 

[Jann3]

@Lana48,

You'll have to make-do with the $1M insurance policy AirBnB offers to protect you as well as the "faux" security deposit that you can place on each reservation. Those "security deposits," btw, are never charged, pre-approved, etc. This is the major downfall of AirBnB - IMHO.